阅读说明：本技术 复合阻火结构的高承压阻火器 (High-pressure-bearing fire arrester with composite fire-retardant structure ) 是由 鲍磊 于安峰 王鹏 党文义 白永忠 邝辰 李厚达 于 2020-06-18 设计创作，主要内容包括：本发明涉及气体安全输送领域,公开了一种复合阻火结构的高承压阻火器,其中,所述复合阻火结构的高承压阻火器包括外壳管、设置在所述外壳管中的阻火部(6)和承压阻火部(5),所述承压阻火部(5)轴向支撑所述阻火部(6)。通过上述技术方案,使用更高强度的承压阻火部代替传统的支撑件,不仅可以为阻火部提供轴向支撑,还与阻火部一并通过传热作用和壁面效应实现阻火功能,能有效提高阻火效率,提高阻火部的承压能力,并简化阻火器结构,缩短轴向距离,实现轻量化设计,解决现有阻火器沉重、轴向过长,阻火效率低、承压能力弱等问题。(The invention relates to the field of gas safety conveying, and discloses a high-pressure-bearing flame arrester of a composite flame-retardant structure, wherein the high-pressure-bearing flame arrester of the composite flame-retardant structure comprises a shell pipe, a flame-retardant part (6) and a pressure-bearing flame-retardant part (5), wherein the flame-retardant part (6) is arranged in the shell pipe, and the pressure-bearing flame-retardant part (5) axially supports the flame-retardant part (6). Through above-mentioned technical scheme, use the pressure-bearing back-fire relief portion of higher intensity to replace traditional support piece, not only can provide the axial support for back-fire relief portion, still with back-fire relief portion in the lump through heat transfer effect and wall effect realization back-fire relief function, can effectively improve back-fire relief efficiency, improve the bearing capacity of back-fire relief portion to simplify the spark arrester structure, shorten axial distance, realize the lightweight design, solve current spark arrester heavy, axial overlength, back-fire relief inefficiency, the bearing capacity subalternation problem.)

1. The high-pressure-bearing flame arrester of the composite flame-retardant structure is characterized by comprising an outer shell pipe, a flame-retardant part (6) and a pressure-bearing flame-retardant part (5) which are arranged in the outer shell pipe, wherein the pressure-bearing flame-retardant part (5) axially supports the flame-retardant part (6).

2. A high pressure-bearing flame arrestor of a composite flame arrestor structure as defined in claim 1, wherein the flame arrestor (6) comprises a corrugated sheet flame arrestor disc and/or a flat sheet flame arrestor disc wound around a central axis.

3. High pressure flame arrestor of composite firestop structures of claim 1, wherein the flame barrier (6) comprises a metallic filler and/or a non-metallic filler.

4. A high pressure-bearing flame arrestor of a composite fire barrier structure as defined in claim 1, wherein the pressure-bearing flame arrestor (5) comprises an apertured plate with axially communicating through-holes.

5. A high pressure flame arrestor of a composite fire barrier structure as defined in claim 4, wherein the through-hole extends axially; and/or the central axis of the extending direction of the through hole forms an included angle; and/or; the through hole has a curved extending path.

6. A high pressure flame arrestor of a composite fire barrier structure as defined in claim 4, wherein the through-hole has a circular, triangular, hexagonal, quadrilateral, or irregularly shaped cross-section.

7. A high pressure-bearing flame arrester as claimed in claim 1 of a composite flame arrester structure, characterized in that the through-hole dimensions of the pressure-bearing flame arrester (5) and of the flame arrester (6) are each smaller than the maximum test flammability interval of a corresponding strength of combustible gas.

8. A high pressure flame arrestor of a composite fire barrier structure as defined in claim 1, wherein the high pressure flame arrestor of a composite fire barrier structure comprises two pressure-bearing flame arrestors (5) and at least one flame arrestor (6) located between the two pressure-bearing flame arrestors (5).

9. A high pressure-bearing flame arrester of a composite flame arrester structure as claimed in claim 1 wherein the high pressure-bearing flame arrester of the composite flame arrester structure comprises two pressure-bearing flame arresters (5) and at least two flame arresters (6) located between the two pressure-bearing flame arresters (5), and wherein one pressure-bearing flame arrester (5) is provided between two flame arresters (6).

10. A high pressure-bearing flame arrestor of a composite flame barrier structure as defined in claim 1, wherein the outer shell tube comprises a flame barrier tube portion (7), the flame barrier (6) and the pressure-bearing flame barrier (5) being disposed in the flame barrier tube portion (7).

11. A high pressure fire barrier of a composite fire barrier structure as claimed in claim 10, wherein the outer shell tube comprises two gradually expanding tube portions (3) connected to both ends of the fire barrier tube portion (7), respectively, a straight tube portion (2) connected to each of the gradually expanding tube portions (3), the fire barrier tube portion (7) having an inner diameter larger than the straight tube portion (2).

12. A high pressure-bearing flame arrester as claimed in claim 11 wherein the flow area of the pressure-bearing flame arrester (5) and the flow area of the flame arrester (6) are each greater than 1.5 times the flow area of the straight pipe portion (2).

13. A high pressure fire barrier of a composite fire barrier structure as claimed in claim 11, wherein the fire barrier tube portion (7) comprises first and second detachably connected tube sections, the first tube section, one of the tapered tube portions (3) and one of the straight tube portions (2) being integrally connected, and the second tube section, the other of the tapered tube portions (3) and the other of the straight tube portions (2) being integrally connected.

14. A high pressure-bearing flame arrester of a composite fire barrier structure as claimed in claim 11, wherein the fire barrier pipe portion (7), the gradually expanding pipe portion (3), and the straight pipe portion (2) are respectively formed as a first portion and a second portion which are divided along a cross section passing through a central axis and detachably connected, the fire barrier pipe portion (7), the gradually expanding pipe portion (3), and the straight pipe portion (2) of the first portion are integrally connected, and the fire barrier pipe portion (7), the gradually expanding pipe portion (3), and the straight pipe portion (2) of the second portion are integrally connected.

15. A high pressure fire barrier of a composite fire barrier structure as claimed in claim 11, wherein the fire barrier tube section (7) is formed as first and second detachably connected sections divided along a section passing through the central axis, the fire barrier tube section (7) being detachably connected to the tapered tube section (3), the tapered tube section (3) being integrally connected to the corresponding straight tube section (2).

16. A high pressure fire barrier of a composite fire barrier structure as claimed in claim 11, wherein the fire barrier tube sections (7) are formed as first and second detachably connected sections divided along a section passing through the central axis, the fire barrier tube sections (7) of the first section being integrally connected to the two gradually expanding tube sections (3), the gradually expanding tube sections (3) being integrally connected to the corresponding straight tube sections (2), and the fire barrier tube sections (7) of the second section being detachably connected to the two gradually expanding tube sections (3), respectively.

17. A high pressure-bearing flame arrester of a composite fire barrier structure as claimed in claim 11, wherein the end of the straight tube portion (2) remote from the flared tube portion (3) is provided with a connector (1).

18. A high pressure-bearing flame arrester of a composite flame arrester structure as claimed in claim 11, characterized in that the inner circumference of the tapered pipe section (3) is provided with a stop block (4) supporting the pressure-bearing flame arrester section (5).

Technical Field

The invention relates to the field of gas safety conveying, in particular to a high-pressure-bearing flame arrester with a composite flame-retardant structure.

Background

The flame arrester of the existing petrochemical device is mainly a corrugated plate flame arrester, namely, the flame arrester mainly comprises a flame arrester shell, a corrugated plate flame-arresting disc and a supporting structure. Wherein, corrugated plate fire stopping plate mainly plays the back-fire relief effect, and bearing structure comprises similar strengthening rib structure more for the protection fire stopping plate structure is not to warping or inefficacy when bearing detonation flame and assaulting. The flame arrester structure has some defects, on one hand, the support structure does not participate in the realization of the flame arresting function, so that the support structure increases the weight and the axial length of the flame arrester to a certain extent, and increases the cost and other hidden troubles; on the other hand, the support structure reduces the effective fire retardant area and increases the flow resistance of the fire retardant device under normal working conditions; in addition, the supporting structure can not realize the strengthening and supporting effect on the whole cross section of the fire retardant disc, so that the completeness of the structure of the fire retardant disc can not be ensured under the conditions of high-power detonation and the like, and the fire retardant disc can deform or even lose efficacy due to the fact that the fire retardant disc is not uniformly stressed.

Disclosure of Invention

The invention aims to provide a high-pressure-bearing fire arrester with a composite fire-retardant structure, and aims to solve the problems that a support structure of the fire-retardant structure reduces the fire-retardant effect, increases the circulation resistance and the like.

In order to achieve the above object, the present invention provides a high pressure-bearing flame arrester of a composite flame arrester structure, wherein the high pressure-bearing flame arrester of the composite flame arrester structure comprises an outer shell pipe, a flame arrester part and a pressure-bearing flame arrester part, wherein the flame arrester part is arranged in the outer shell pipe, and the pressure-bearing flame arrester part axially supports the flame arrester part.

Optionally, the firestop comprises a corrugated plate fire retardant disc and/or a flat plate fire retardant disc wound about a central axis.

Optionally, the firestop comprises a metallic filler and/or a non-metallic filler.

Optionally, the pressure-bearing flame barrier comprises an apertured plate having an axially communicating through-hole.

Optionally, the through-hole extends axially; and/or the central axis of the extending direction of the through hole forms an included angle; and/or; the through hole has a curved extending path.

Alternatively, the through-hole has a circular, triangular, hexagonal, quadrangular, or irregularly shaped cross-section.

Optionally, the size of the through hole of the pressure-bearing fire retardant part and the size of the through hole of the fire retardant part are respectively smaller than the maximum test combustible interval of the combustible gas with corresponding strength.

Optionally, the high pressure flame arrestor of the composite flame barrier structure comprises two pressure-bearing flame arrestors and at least one flame arrestor located between the two pressure-bearing flame arrestors.

Optionally, the high pressure-bearing flame arrestor of the composite flame barrier structure comprises two pressure-bearing flame arrestors and at least two flame arrestors between the two pressure-bearing flame arrestors, and wherein one pressure-bearing flame arrestor is disposed between two flame arrestors.

Optionally, the outer shell tube comprises a firestop tube portion, the firestop portion and the pressure-bearing firestop portion being disposed in the firestop tube portion.

Optionally, the outer shell pipe comprises two gradually-expanded pipe parts respectively connected to two ends of the fire retardant pipe part, and a straight pipe part connected to each gradually-expanded pipe part, and the inner diameter of the fire retardant pipe part is larger than that of the straight pipe part.

Optionally, the flow area of the pressure-bearing flame retardant part and the flow area of the flame retardant part are both larger than 1.5 times of the flow area of the straight pipe part.

Optionally, the fire retardant pipe portion comprises a first pipe section and a second pipe section which are detachably connected, the first pipe section, one of the tapered pipe portions and one of the straight pipe portions are integrally connected, and the second pipe section, the other of the tapered pipe portions and the other of the straight pipe portions are integrally connected.

Optionally, the fire retardant pipe portion, the gradually-expanded pipe portion and the straight pipe portion are respectively formed into a first portion and a second portion which are divided along the section passing through the central axis and detachably connected, the fire retardant pipe portion, the gradually-expanded pipe portion and the straight pipe portion of the first portion are integrally connected, and the fire retardant pipe portion, the gradually-expanded pipe portion and the straight pipe portion of the second portion are integrally connected.

Alternatively, the fire retardant pipe portion is formed as a first portion and a second portion which are divided along a section passing through the central axis and detachably connected, the fire retardant pipe portion is detachably connected to the gradually expanding pipe portion, and the gradually expanding pipe portion is integrally connected to the corresponding straight pipe portion.

Optionally, the fire-retardant pipe part is formed into a first part and a second part which are separated along the section passing through the central axis and detachably connected, the fire-retardant pipe part of the first part is integrally connected with the two gradually-expanded pipe parts, the gradually-expanded pipe parts are integrally connected with the corresponding straight pipe parts, and the fire-retardant pipe part of the second part is detachably connected with the two gradually-expanded pipe parts respectively.

Optionally, one end of the straight pipe part, which is far away from the gradually-expanded pipe part, is provided with a connecting piece.

Optionally, a stop block for supporting the pressure-bearing flame-retardant part is arranged on the inner circumferential surface of the gradually-expanded pipe part.

Through above-mentioned technical scheme, use the pressure-bearing back-fire relief portion of higher intensity to replace traditional support piece, not only can provide the axial support for back-fire relief portion, still with back-fire relief portion in the lump through heat transfer effect and wall effect realization back-fire relief function, can effectively improve back-fire relief efficiency, improve the bearing capacity of back-fire relief portion to simplify the spark arrester structure, shorten axial distance, realize the lightweight design, solve current spark arrester heavy, axial overlength, back-fire relief inefficiency, the bearing capacity subalternation problem.

Drawings

FIG. 1 is a schematic structural view of a high pressure flame arrestor of a composite flame barrier structure according to embodiments of the invention;

FIGS. 2-4 are cross-sectional views of pressure-bearing firestops according to embodiments of the present invention;

FIG. 5 is a schematic illustration of a through-hole in a pressure-bearing firestop according to an embodiment of the present invention;

FIGS. 6 and 7 are schematic illustrations of pressure-bearing firestops and arrangements of firestops according to embodiments of the invention;

FIG. 8 is a schematic structural view of a high pressure flame arrestor of a composite flame barrier structure according to an embodiment of the invention;

FIG. 9 is a schematic structural view of a high pressure flame arrestor of a composite flame barrier structure according to an embodiment of the invention;

FIG. 10 is a schematic representation of the construction of a high pressure flame arrestor of a composite flame barrier structure according to one embodiment of the invention.

Description of the reference numerals

1 connecting piece 2 straight pipe part

3 gradually expanding pipe part 4 stopper

5 pressure-bearing fire-retardant part 6 fire-retardant part

7 fire-retardant pipe part

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The axial direction referred to in this invention refers to the axial direction of the high pressure-bearing flame arrestor of the composite flame arrestor structure.

The invention provides a high-pressure-bearing flame arrester of a composite flame-retardant structure, wherein the high-pressure-bearing flame arrester of the composite flame-retardant structure comprises an outer shell pipe, a flame-retardant part 6 and a pressure-bearing flame-retardant part 5, wherein the flame-retardant part 6 is arranged in the outer shell pipe, and the pressure-bearing flame-retardant part 5 axially supports the flame-retardant part 6.

Flame arrestors may be used in gas delivery lines to block further spread of fire when the gas in the line is accidentally burned. Wherein the housing tube of the flame arrester can be connected in the conveying line and wherein a flame arresting member is provided to achieve flame arresting.

Specifically, referring to fig. 1, a fire barrier 6 and a pressure-bearing fire barrier 5 are arranged in the shell pipe; the fire retardant part 6 can be made of non-combustible materials and is provided with a through hole, so that gas can pass through the through hole, flame can be blocked from passing through the through hole, and the fire retardant function is realized; the pressure-bearing fire retardant part 5 is a structure with stronger pressure resistance, namely, the structure is not easy to deform under the action of pressure, and the structure with the through hole is also made of non-combustible materials, so that the structure also has the fire retardant function.

The more stable pressure-bearing back-fire relief portion 5 of structure supports back-fire relief portion 6 in the axial, can be so that back-fire relief portion 6 is in comparatively stable state, keeps back-fire relief portion 6 in suitable position, avoids back-fire relief portion 6 to take place structural change under the impact of air current, guarantees back-fire relief portion 6's back-fire relief performance.

In addition, the pressure-bearing flame arrester 5 can be fixed in the housing tube in a variety of ways, for example by being bolted to the inner wall of the housing tube, or axially spaced stops 4 can be provided on the inner wall of the housing tube to axially clamp the pressure-bearing flame arrester 5, so that the flame arrester 6 is axially clamped and fixed by the pressure-bearing flame arrester 5.

For the flame arrester, in order to guarantee specific horizontally back-fire relief ability, wherein the axial total length of back-fire relief structure is basic definite, in this scheme, use pressure-bearing back-fire relief 6 to replace ordinary back-fire relief 5 and support piece of original partly, the axial total length of pressure-bearing back-fire relief 6 and back-fire relief 5 is unanimous basically with the axial total length of back-fire relief in the present flame arrester, consequently, can save the shared axial length of support piece to axial length has been reduced, overall structure has been simplified.

The structure of the firestop portion 6 may take a variety of forms, each of which will be described below.

According to one embodiment of the invention, the firestop 6 comprises a corrugated plate fire stop disc and/or a flat plate fire stop disc wound around a central axis. The flame arrestor 6 comprises a plurality of corrugated and/or flat flame arrestor discs coiled about a central axis, with adjacent flame arrestor discs being spaced apart to allow gas to pass through and to block the passage of flames; the corrugated and/or flat fire retardant discs may be made of metallic or non-metallic non-combustible materials. It should be noted that in the winding structure of the corrugated plate fire retardant disc and/or the flat plate fire retardant disc, an opening with a larger size is formed at the central axis, and the opening can be filled with other fire retardant materials, or a threaded hole with approximately the same size is arranged at the central axis of the pressure-bearing fire retardant part 5, and a bolt passes through the threaded hole and the opening to connect the pressure-bearing fire retardant part 5 and the fire retardant part 6.

According to another embodiment of the invention, the firestop 6 comprises a metallic filler and/or a non-metallic filler. The metallic filler and/or the non-metallic filler may be in the form of particles, with gaps formed between adjacent particles to allow gas to pass through.

In addition, the pressure-bearing flame arrestor 5 comprises an orifice plate with an axially communicating through-hole. The orifice plate may be made of a non-combustible metallic or non-metallic material in which axially communicating through-holes are formed to allow the passage of gas. The perforated plate is of a non-deformable construction and can stably support the firestop 5 in the axial direction. In addition, when the fire barrier 6 is composed of granular metal filler or non-metal filler, if the granularity of the granular metal filler or non-metal filler is smaller than the inner diameter of the through hole of the pressure-bearing fire barrier 5, a screen structure with meshes smaller than the size of the granules can be arranged on the end surface of the pressure-bearing fire barrier 5 facing the fire barrier 6 so as to prevent the filler from entering the through hole of the pressure-bearing fire barrier 5.

Referring to FIG. 5, the through-hole in the pressure-bearing firestop 5 is variously arranged, for example, it extends axially; and/or the central axis of the extending direction of the through hole forms an included angle; and/or; the through hole has a curved extending path. These different types of through-holes may be provided in only one type or in a plurality of types in one pressure-bearing flame retardant member 5.

In addition, the through-hole has a cross-section of a circular, triangular, hexagonal, quadrangular, or irregular shape. Referring to fig. 2, the through hole in the pressure-bearing flame retardant part 5 has a hexagonal cross section, the through hole in the pressure-bearing flame retardant part 5 shown in fig. 3 has a quadrangular cross section, and the through hole in the pressure-bearing flame retardant part 5 shown in fig. 4 has a cross-shaped cross section, but the cross section of the through hole may be circular, triangular or other irregular shapes, and one or more types of through holes may be provided in the same pressure-bearing flame retardant part 5.

The size of the through hole of the pressure-bearing fire retardant part 5 and the size of the through hole of the fire retardant part 6 are respectively smaller than the maximum test combustible interval of combustible gas with corresponding strength. For combustible gases of different strength grades, which have a maximum test combustible gap (MESG), the dimensions of the through-hole of the pressure-bearing fire barrier 5 and the dimensions of the through-hole of the fire barrier 5 should be smaller than the maximum test combustible gap, with reference to the table below, to ensure fire barrier capability and prevent flame spread.

Grade of explosion	Mixture MESG, mm
		ⅡA1	≥1.14
ⅡAb	≥0.90
		ⅡB1b	≥0.85
ⅡB2b	≥0.75
		ⅡB3b	≥0.65
ⅡBb	≥0.50
		ⅡC	≥0.50

The arrangement of the firestops 6 and the pressure-bearing firestops 5 in the outer shell tube can take a variety of forms, as will be described separately below.

According to one embodiment of the invention, the high pressure flame arrestor of the composite firestop structure comprises two pressure-bearing flame arrestors 5 and at least one flame arrestor 6 located between the two pressure-bearing flame arrestors 5. As shown in fig. 6, two pressure-bearing flame barriers 5 are provided, with three flame barriers 6 in between, although in other embodiments one, two or another number of flame barriers 6 may be provided.

According to another embodiment of the invention, the high pressure flame barrier of the composite flame barrier structure comprises two pressure-bearing flame barriers 5 and at least two flame barriers 6 located between the two pressure-bearing flame barriers 5, and wherein one pressure-bearing flame barrier 5 is located between two flame barriers 6. As shown in fig. 7, two ends of the fire-retardant part are respectively provided with a pressure-bearing fire-retardant part 5, and the middle of the fire-retardant part is provided with 4 fire-retardant parts 6, wherein the number of the fire-retardant parts is only schematic and does not represent the specific number. For the structural parameters of the designed flame retardant part 6, if a flame retardant part with the thickness of 100mm is needed, 1 whole flame retardant part with the thickness of 100mm can be adopted, and a plurality of flame retardant parts with the total thickness of 100mm, such as 5 flame retardant parts with the thickness of 20mm, or 2 flame retardant parts with the thicknesses of 20mm and 30mm can be adopted. And a pressure-bearing fire retardant part 5 is arranged between the two middle fire retardant parts 6, and the three pressure-bearing fire retardant parts 5 can more stably support the fire retardant parts 6 with lower structural strength.

Referring to fig. 6 and 7, the pressure-bearing flame-retardant portions 5 at both ends are supported by the stopper 4, and the stopper 4 is provided on the inner wall of the outer shell pipe, for example, the inner wall of the divergent pipe portion 3. In addition, the axial dimension of the pressure-bearing flame retardant 5 and the dimension of the flame retardant 6 may be set as desired, the axial dimension of the pressure-bearing flame retardant 5 may be larger than, smaller than, or equal to the dimension of the flame retardant 6, and the dimension of the pressure-bearing flame retardant 5 in the intermediate position in fig. 7 may be smaller.

Specifically, the outer shell pipe comprises a fire retardant pipe part 7, and the fire retardant part 6 and the pressure-bearing fire retardant part 5 are arranged in the fire retardant pipe part 7. The fire retardant pipe part 7 is formed into a straight pipe with a constant inner diameter, and the fire retardant part 6 and the pressure-bearing fire retardant part 5 have outer circumferential dimensions approximately equal to the inner diameter of the fire retardant pipe part 7, namely, the fire retardant pipe part 7 is filled, so that a large gap is avoided and flame is allowed to pass through. In addition, the substantially straight tubular firestop tube portion 7 also facilitates assembly in which the individual firestops are permitted to move axially.

Further, the outer shell pipe including connect respectively in two gradual expansion pipe portions 3 at back-fire relief pipe portion 7 both ends, connect in every the straight tube portion 2 of gradual expansion pipe portion 3, the internal diameter of back-fire relief pipe portion 7 is greater than straight tube portion 2. As shown in fig. 1, the outer shell tube comprises a straight tube part 2, an expanding tube part 3, a fire-retardant tube part 7, an expanding tube part 3 and a straight tube part 2 which are connected in sequence, wherein the two straight tube parts 2 are used for being connected with a gas conveying pipeline, and the expanding tube part 3 can be used for transitionally connecting the straight tube part 2 with a smaller inner diameter and the fire-retardant tube part 7 with a larger inner diameter; the fire retardant pipe part 7 adopts a larger inner diameter so as to ensure that enough through holes are formed in the fire retardant part 6 and the pressure-bearing fire retardant part 5 and ensure that gas from the straight pipe part 2 smoothly passes through the fire retardant pipe part 7.

Further, the flow area of the pressure-bearing fire retardant part 5 and the flow area of the fire retardant part 6 are both larger than 1.5 times of the flow area of the straight pipe part 2. The flow area of the pressure-bearing flame barrier 5 is approximately the sum of the cross-sectional areas of the through-holes therein, the flow area of the flame barrier 6 is approximately the sum of the cross-sectional areas of the through-holes therein, and the maximum flow permitted in the pressure-bearing flame barrier 5 and the flame barrier 6 should be greater than the maximum flow in the straight pipe portion 2 to avoid blocking the flow of gas.

The fire retardant part 6 and the pressure-bearing fire retardant part 5 in the high pressure-bearing fire retardant device of the composite fire retardant structure can be in a detachable form so as to be convenient for maintenance and replacement, and different forms of fire retardant structures will be described respectively below.

According to an embodiment of the invention, the fire barrier tube portion 7 comprises a first tube section and a second tube section which are detachably connected, the first tube section, one of the tapered tube portions 3 and one of the straight tube portions 2 being integrally connected, and the second tube section, the other of the tapered tube portions 3 and the other of the straight tube portions 2 being integrally connected. Referring to fig. 1, the firestop tube portion 7 is divided into two removable sections, a first section and a second section (not shown), the two sections being provided with flanges at their ends opposite to each other and connectable to each other by the flanges, which allows the firestop tube portion 7 to be removed and installed to allow the firestop portion 6 and the pressure-bearing firestop portion 7 to be placed therein and replaced for maintenance.

According to another embodiment of the present invention, referring to fig. 8, the flame retardant pipe portion 7, the gradually expanding pipe portion 3, and the straight pipe portion 2 are respectively formed as a first portion and a second portion which are detachably connected and divided along a cross section passing through the central axis, the flame retardant pipe portion 7, the gradually expanding pipe portion 3, and the straight pipe portion 2 of the first portion are integrally connected, and the flame retardant pipe portion 7, the gradually expanding pipe portion 3, and the straight pipe portion 2 of the second portion are integrally connected. The flame-retardant pipe portion 7, the divergent pipe portion 3 and the straight pipe portion 2 are each formed as two half pipe portions, i.e., a first portion and a second portion, or it can be understood that the outer shell pipe, which is integrally formed, is divided into two portions, and the first portion (upper half structure in fig. 8) and the second portion (lower half structure in fig. 8) are provided with flanges at positions opposite to each other, and the two portions can be connected together by the flanges.

According to another embodiment of the present invention, referring to fig. 9, the flame retardant pipe portion 7 is formed as a first portion and a second portion which are detachably connected, divided in a section passing through the central axis, the flame retardant pipe portion 7 is detachably connected to the tapered pipe portion 3, and the tapered pipe portion 3 is integrally connected to the corresponding straight pipe portion 2. The flame trap section 7 is divided into a first section and a second section, which are flange-connected to each other, and both ends of the first section and the second section are detachably connected to the divergent section 3, for example, by flanges.

According to another embodiment of the present invention, referring to fig. 10, the flame retardant pipe portion 7 is formed as a first portion and a second portion which are detachably connected, divided in a section passing through the central axis, the flame retardant pipe portion 7 of the first portion is integrally connected to the two tapered pipe portions 3, the tapered pipe portions 3 are integrally connected to the corresponding straight pipe portions 2, and the flame retardant pipe portions 7 of the second portion are detachably connected to the two tapered pipe portions 3, respectively. The flame trap section 7 is divided into two parts, a first part of which is integrally connected to the tapered pipe sections 3 at both ends, and a second part of which is detachably connected, for example, flanged, to the first part and to the two tapered pipe sections 3.

In addition, one end of the straight pipe part 2, which is far away from the gradually expanding pipe part 3, is provided with a connecting piece 1. The connecting piece 1 can be of a flange structure, and the straight pipe part 2 can be connected with a pipeline for conveying gas through the connecting piece 1 so as to connect a high-pressure-bearing flame arrester of the composite flame-retardant structure into the pipeline.

Wherein, the inner peripheral surface of the gradually expanding pipe part 3 is provided with a stop block 4 for supporting the pressure-bearing fire retardant part 5. Referring to fig. 1, gradually be formed with backstop 4 on the inner peripheral surface of expanding pipe portion 3 near the one end of back-fire relief pipe portion 7, backstop 7 can support pressure-bearing back-fire relief portion 5 axially, and two backstop 4 can form the centre gripping to middle pressure-bearing back-fire relief portion 5 and back-fire relief portion 6, realize back-fire relief portion 6 and pressure-bearing back-fire relief portion 5's axial fixity, avoid appearing warping not hard up and influence back-fire relief effect.

Through above-mentioned technical scheme, use the pressure-bearing back-fire relief portion of higher intensity to replace traditional support piece, not only can provide the axial support for back-fire relief portion, still realize the back-fire relief function through heat transfer effect and wall effect with back-fire relief portion in the lump, can effectively improve back-fire relief efficiency, improve the bearing capacity of back-fire relief portion to simplify the back-fire relief ware structure, shorten axial distance, realize lightweight design (pressure-bearing back-fire relief portion design thickness), it is heavy to solve current back-fire relief ware, axial overlength, back-fire relief inefficiency, the bearing capacity subalternation problem.

The pressure-bearing fire-resisting part is designed according to application scenes (including specification, test medium, initial pressure and the like) to bear pressure, and axial pressure bearing Pc and initial pressure P₀The relationship is shown in the following table.

The material can be stainless steel, or stainless steel plus aluminum alloy, stainless steel plus nonmetal material (polytetrafluoroethylene), etc.

If the pressure-bearing fire-retardant part is designed to be made of stainless steel and needs to be 20mm thick, the combination of 15mm stainless steel and 8mm aluminum alloy or the combination of 15mm stainless steel and 10mm polytetrafluoroethylene can be selected.

For a typical conventional flame arrestor, the flame arrestor strength type IIA DN100 detonation is taken as an example. The test is carried out by adopting propane and air media, for a traditional flame arrester, the thickness of a flame arrester part is generally 150mm, the typical gap value of the flame arrester part is about 0.8mm, the thickness of a supporting structure is 15mm, the two flame arrester parts are symmetrical, and the whole length of the flame arrester is 730 mm; tests show that the initial detonation pressure of the high-pressure-resistant composite material is 1.1bar, the detonation impact pressure is 15.2bar, and the resistance is 300Pa when the corresponding flow rate is 200Nm 3/h.

In the embodiment of the invention, the fire retardant parts with the same structure are adopted, the thickness is 30mm, the supporting structure adopts 2 pressure-bearing fire retardant parts which are symmetrically distributed, the thickness of each block is 10mm, a slit type structure is adopted, the size of the slit is 0.8 multiplied by 5mm, the overall porosity is about 0.68, and the supporting structure is made of stainless steel; the flame arrestor has an overall length of 600mm and is assembled as shown in fig. 8, i.e. sealed axially up and down. Through tests, the initial detonation pressure borne by the high-pressure jet pump is 1.56bar, the detonation impact pressure is 21.4bar, the resistance is 270Pa when the corresponding flow rate is 200Nm3/h, the pressure bearing capacity is improved by 40.8 percent compared with that of the traditional structure, and the resistance drop is reduced by about 10 percent; the axial length is shortened by 18%.

Further, comparative testing studies were conducted on type IIB3 DN150 detonation type flame arrestors. The test is carried out by adopting an ethylene and air medium, for a traditional flame arrester, the thickness of a fire-retardant part is generally 150mm, the typical gap value of the fire-retardant part is about 0.5mm, the thickness of a supporting structure is 18mm, the two parts are symmetrical, and the whole length of the flame arrester is 736 mm; tests show that the initial detonation pressure of the high-pressure-resistant composite material is 1.1bar, the detonation impact pressure is 14.7bar, and the resistance is 782Pa when the corresponding flow rate is 300Nm 3/h.

The fire retardant parts with the same structure are adopted in the embodiment of the invention, the thickness is 40mm, the supporting structure adopts 2 pressure-bearing fire retardant parts which are symmetrically distributed, the thickness of a single block is 10mm, a porous (round hole) structure is adopted, the size of the round hole is 0.5mm, the axial included angle is 20 degrees, the integral porosity is about 0.65, and the supporting structure is made of stainless steel; the flame arrestor has an overall length of 610mm and is assembled as shown in figure 9. Tests show that the initial detonation pressure borne by the high-pressure detonation flow is 1.54bar, the detonation impact pressure is 20.9bar, the resistance position is 625Pa when the corresponding flow rate is 300Nm3/h, the pressure bearing capacity is improved by 42.2 percent compared with that of the traditional structure, and the resistance drop is reduced by about 20.1 percent; the axial length is shortened by 17.1%.

It can be seen through the contrast that compound back-fire relief structure's high pressure-bearing back-fire relief ware compares and has higher intensity in traditional back-fire relief portion to compare and also have higher intensity in original bearing structure, especially pressure-bearing back-fire relief portion itself also has the back-fire relief function, can be used for replacing partly of traditional back-fire relief ware, and save bearing structure, thereby reduced holistic axial length, the structure is simpler, compact.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.